CheckDigits::MXX_003(3User Contributed Perl DocumentatiCheckDigits::MXX_003(3)NAME
CheckDigits::MXX_003 - compute check digits for DEM
SYNOPSIS
use Algorithm::CheckDigits;
$dem = CheckDigits('dem');
if ($dem->is_valid('GD0645027K1')) {
# do something
}
$cn = $dem->complete('GD0645027K');
# $cn = 'GD0645027K1'
$cd = $dem->checkdigit('GD0645027K1');
# $cd = '1'
$bn = $dem->basenumber('GD0645027K1');
# $bn = 'GD0645027K'
DESCRIPTION
ALGORITHM
The algorithm is a variation of the Verhoeff scheme.
0 All letters are changed to numbers.
1 All digits are permutated according to a permutation table.
2 The permutated digits are combined using a diA~Xder table. The
first with the second, the result with the third, this result with
the fourth and so on.
3 The result of the last combination in the diA~Xder table is in such
a way combined that the result is 0 (zero). The number used for
this combination is the checksum.
For details look at the source.
METHODS
is_valid($number)
Returns true only if $number consists solely of numbers and the
last digit is a valid check digit according to the algorithm given
above.
Returns false otherwise,
complete($number)
The check digit for $number is computed and concatenated to the end
of $number.
Returns the complete number with check digit or '' if $number does
not consist solely of digits and spaces.
basenumber($number)
Returns the basenumber of $number if $number has a valid check
digit.
Return '' otherwise.
checkdigit($number)
Returns the checkdigit of $number if $number has a valid check
digit.
Return '' otherwise.
EXPORT
None by default.
AUTHOR
Mathias Weidner, <mathias@weidner.in-bad-schmiedeberg.de>
THANKSSEE ALSO
perl, CheckDigits, www.pruefziffernberechnung.de,
perl v5.14.1 2011-06-20 CheckDigits::MXX_003(3)
